Models of the Location of Hub Facilities

越来越多地使用“集线器”作为交换中心， 大量的交通量已经改变了许多人的性格， 交通和通信网络。 地理学者， 区域科学、运筹学和相关领域最近 更多地关注枢纽在流通网络中的作用，但 迄今为止进行的大多数研究都集中在 单个节点，而不是整个网络。 本研究 该项目将建立在调查人员已经完成的工作基础上， 增强了空间相互作用的理论模型。 这些改进 将决定最适合于 网络和通过网络的流的最佳路由。 的 研究将结合联合收割机扩展的数学模型，以适应 更准确反映实际情况的其他因素 网络的功能，启发式的发展， 更好地确定这种复杂模型的解决方案的方法， 以及对网络图形表示的分析， 替代网络的连通性和效率。 该项目将 为各种类型的枢纽系统的实证分析奠定基础， 不同类型的网络。 该项目将大大推进理论理解 流通系统中枢纽的作用， 表示网络配置和操作，并通过评估集线器 从整体网络效率的角度来看。 先前 调查人员沿着这条线索进行的调查工作已经是一个 其他学者研究空间的新研究的催化剂 互动和其他地点因素;该项目将继续 促进这种进步。 这项研究最终也将 通过提供更好的评估基础， 真实的流通网络的运作， 制定新的程序，以确定最佳配置的 新的网络。

Increasing use of "hubs" as switching centers through which large volumes of traffic are channelled has transformed the character of many transportation and communications networks. Scholars in geography, regional science, operations research, and related fields have recently given more attention on the role of hubs in circulation networks, but most studies conducted to date have focused on the characteristics of individual nodes rather than on the entire network. This research project will build on work already completed by the investigator that enhances theoretical models of spatial interaction. These improvements will determine the number and location of hubs that would best serve a network and the best routing of flows through the network. The research will combine extension of mathematical models to accommodate additional factors that more accurately reflect actual conditions within which networks function, the development of heuristic procedures for better determining solutions for such complex models, and the analyses of graphic representations of networks to measure the connectivity and efficiency of alternative networks. The project will set the stage for empirical analyses of hub systems in a variety of different types of networks. This project will significantly advance theoretical understandings of the roles of hubs within circulation systems by more realistically representing network configurations and operations and by assessing hub operations from perspectives of overall network efficiency. Previous work by the investigator along this line of inquiry already has been a catalyst for new studies by other scholars examining spatial interaction and other locational factors; this project will continue to foster that kind of advancement. This research ultimately will also yield practical rewards, by providing an improved basis for assessing the operation of real circulation networks and by encouraging development of new procedures for determining optimal configurations of new networks.